I have an 04 mountaineer AWD with the 4.0 and K as the 8th vin digit.
The motor is blown with 144k. I need to put in a new motor. Will a 2002-2005 mountaineer 4.0 motor work, are they all the same. Will an Explorer 4.0 in 02-05 work? I'm having a hard time finding an 04 with less than 100K.

pcm is the control module. If you look under the hood, all the wiring will centralize into a small metal box with several connectors that the wires are connected on.

I'd go for a newer 4.0L engine as it'll have less rust and lower mileage. There weren't any significant changes with the design of the engine block.

If you can, try to find a similar engine from a similar (newer) vehicle that's AWD and purchase the PCM. If you can get a deal on it, get the wiring harness too. This will limit any problems associated with check engine lights, etc. If cost is an issue you might be out of luck on finding an engine with lower mileage.

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